Option Explicit

Sub patternCouleur()
Dim lig As Long, derlig As Long
derlig = Cells(Rows.Count, 4).End(xlUp).Row
For lig = 2 To derlig
patternCouleurLig (lig)
Next lig
End Sub

Sub patternCouleurLig(lig As Long)
Dim s As String
Dim R As Long, V As Long, B As Long
R = CLng("&h" & Cells(lig, 2))
V = CLng("&h" & Cells(lig, 3))
B = CLng("&h" & Cells(lig, 4))
Application.EnableEvents = False
Cells(lig, 8) = [Pattern]
Cells(lig, 8).Resize(1, 2).Font.Color = RGB(R, V, B)
Application.EnableEvents = True
End Sub

Private Sub Worksheet_Change(ByVal Target As Range)
Dim col As Long, w3c As String
If Target.Count > 1 Then Exit Sub
If Target.Row < 5 Or Target.Column > 4 Then Exit Sub
Application.EnableEvents = False
If Target.Column = 1 Then
' formatage saisie w3c
w3c = Cells(Target.Row, 1)
If Left(w3c, 1) = "#" Then w3c = Mid(w3c, 2)
w3c = "#" & UCase(Right("000000" & w3c, 6))
' maj cellules
Cells(Target.Row, 1) = w3c
Cells(Target.Row, 2) = Mid(w3c, 2, 2)
Cells(Target.Row, 3) = Mid(w3c, 4, 2)
Cells(Target.Row, 4) = Right(w3c, 2)
Else ' colonnes B:D
' formatage saisie RVB
Target = Right("00" & UCase(Target), 2)
' maj w3c
For col = 2 To 4
w3c = w3c & Right("00" & Cells(Target.Row, col), 2)
Next col
Cells(Target.Row, 1) = "#" & w3c
End If
Application.EnableEvents = True
patternCouleurLig (Target.Row)
End Sub